du·al /ˈdu(ə)l ||ˈdjuəl/
 (a.)雙重的,雙的雙數


 dual
 邏輯被動自動對偶 LPSD


 dual
 自對偶


 dual
 雙


 Du·al a.  Expressing, or consisting of, the number two; belonging to two; as, the dual number of nouns, etc. , in Greek.
    Here you have one half of our dual truth.   --Tyndall.

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 dual
      adj 1: consisting of or involving two parts or components usually
             in pairs; "an egg with a double yolk"; "a double
             (binary) star"; "double doors"; "dual controls for
             pilot and copilot"; "duple (or double) time consists
             of two (or a multiple of two) beats to a measure"
             [syn: double, duple]
      2: having more than one decidedly dissimilar aspects or
         qualities; "a double (or dual) role for an actor"; "the
         office of a clergyman is twofold; public preaching and
         private influence"- R.W.Emerson; "every episode has its
         double and treble meaning"-Frederick Harrison [syn: double,
          twofold, treble, threefold]
      3: a grammatical number category referring to two items or
         units as opposed to one item (singular) or more than two
         items (plural); "ancient Greek had the dual form but it
         has merged with the plural form in modern Greek"